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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A123797 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 6 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.

Table of values

n a(n)
1 1
2 1
3 7
4 10
5 88
6 142
7 1277
8 2193
9 19967
10 35449
11 325809
12 593589
13 5473435
14 10159187
15 93929982
16 176846933

List of values

[1, 1, 7, 10, 88, 142, 1277, 2193, 19967, 35449, 325809, 593589, 5473435, 10159187, 93929982, 176846933]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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